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polygraph

polygraph

67 6.0
A machine that records body reactions to see if someone is lying
  • noun
  • /ˈpɒlɪˌɡræf/
  • Specialized
translation icon : polígrafo
  • Are you taking this polygraph at the request of the publisher?
  • polygraph test
  • standard-issue polygraph

So they hired him to give Nick the polygraph.

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Examples

  • She passed the polygraph.

  • You took a polygraph after you shot those two people, didn't you?

    Fiction book (1992)
  • Eventually there was a a polygraph test and I failed one question.

  • Sources report the married suspect agreed to take a polygraph test, which he failed.

  • I am taking a polygraph exam.

  • Now, both your drivers passed their polygraph test with flying colors.

  • The next day, Dennis made Ivy go downtown for a polygraph test.

    Fiction book (1991)
  • When asked if he was willing to take a polygraph test, Absalon said that he would.

    Blog text (18)
  • A polygraph test is inadmissible evidence in our courts.

  • The detective used a polygraph to determine if the suspect was telling the truth.

Synonyms

lie detector
vspolygraph
  • Specialized
52 4.4

A machine that measures blood pressure, pulse, and breathing to check if someone is lying

is the formal technical term used in professional and scientific contexts

How Comprehensive

polygraph
  • Archaic
4 6.1
polygraph
  • Specialized
67 6.0
cardiac monitor
  • Specialized
2 3.7
scaler
  • Specialized
8.4

Surface Forms

polygraph singular
polygraphs plural

Morphology

polygraph = graph (opaque) = poly + graph

Although the word is formally built from poly- + graph, the modern lie-detector sense is a specialized extension that is not directly predictable from the parts.

Etymology

The word polygraph comes from poly 'many' and graph 'to write' or 'to record', the same idea you see in photograph. A helpful way to remember it is to imagine a device that records many body signals to check if someone is telling the truth, which is why a polygraph is often called a 'lie detector'.